Figure 1
From: Air-like plasmonics with ultralow-refractive-index silica aerogels
(a) Fabrication procedure for the silver-coated silica aerogel structure: the silica wet gel was prepared by mixing MTMS, surfactant, and acetic acid. The aerogels were obtained by drying the wet gel with supercritical carbon dioxide at 80 °C and 13.5 MPa. A thin silver film was deposited on the aerogel by electron-beam evaporation to create a plasmonic nanogap-based surface-enhanced Raman scattering active substrate. (b) Fabrication flow chart of the localized plasmonic sensor with aerogel.
